MTN advsertises 80 gig contract, but only loads 40 gig. Still no joy correcting this after two mo

I app**** online for a special of 40gig day, 40 gig night Datashare (80 gig total). MTN called me back and despite confirming NUMEROUS TIMES I want the 80 gig contract, loaded only 40 gig (20 day, 20 night) WITHOUT advising me that I would ONLY GET 40 Gig and not 80 Gig.

When phoning to enquire month 1, I was told it was "pro rata", that's why only 13 gig was loaded.

Month 2, the "full" amount was supposed to be loaded, but only 20 gig was loaded. Being given the runaround for TWO MONTHS and everybody "escalates the query", but NO SOLUTION HAS BEEN OFFERED.

HOW LONG DOES ONE HAVE TO KEEP "following up" to get this fixed?!!!

THEN I GET TOLD THAT THERE WILL BE A R2000 "early termination" CHARGE if I should cancel the contract. Why?! MTN BREACHED THE CONTRACT IN THE FIRST PLACE, WHY SHOULD THERE BE ANY CHARGES TO CANCEL?

WHY ADVERTISE ONE PRODUCT, BUT LOAD ANOTHER?? AND THEN NOT FIX IT FOR MORE THAN TWO MONTHS???

MTN STOLE MORE THAN 60 GIG FROM ME BASED ON THIS ALREADY!!!